/*
 * Copyright (C) 2008 Pleyo.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Pleyo nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PLEYO AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL PLEYO OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "WebDocumentLoader.h"

using namespace WebCore;

WebDocumentLoader::WebDocumentLoader(const ResourceRequest& request, const SubstituteData& substituteData)
    : DocumentLoader(request, substituteData)
    , m_dataSource(0)
    , m_detachedDataSource(0)
{
}

PassRefPtr<WebDocumentLoader> WebDocumentLoader::create(const ResourceRequest& req, const SubstituteData& data)
{
    return adoptRef(new WebDocumentLoader(req, data));
}

WebDocumentLoader::~WebDocumentLoader()
{
    if(m_detachedDataSource)
        delete m_detachedDataSource;
    if (m_dataSource)
        delete m_dataSource;
}

void WebDocumentLoader::setDataSource(WebDataSource *dataSource)
{
    ASSERT(!m_dataSource);
    m_dataSource = dataSource;
}

WebDataSource* WebDocumentLoader::dataSource() const
{
    return m_dataSource;
}

void WebDocumentLoader::detachDataSource()
{
    // we only call detachDataSource when the WebDataSource is freed - and we won't get there if m_dataSource is not
    // null (because that would mean the loader still has a reference to the data source)
    ASSERT(!m_dataSource);
    m_detachedDataSource = 0;
}

void WebDocumentLoader::attachToFrame()
{
    DocumentLoader::attachToFrame();
    if (m_detachedDataSource) {
        ASSERT(!m_dataSource);
        setDataSource(m_detachedDataSource);
        m_detachedDataSource = 0;
    }
}

void WebDocumentLoader::detachFromFrame()
{
    DocumentLoader::detachFromFrame();
    m_detachedDataSource = m_dataSource;
    if (m_dataSource) {
        WebDataSource* dataSourceToBeReleased = m_dataSource;
        // It's important to null out m_dataSource before calling release on the data source.  That release can cause the data
        // source to be deleted - which ends up calling loader->detachDataSource() which makes the assumption that the loader no 
        // longer holds a reference to the data source.
        m_dataSource = 0;
        delete dataSourceToBeReleased;
    }
}
